Measured service telephone system



Se'pt. 28, 1937. F. APPELIUS El AL I I MEASURED SERVICE TELEPHONE SYSTEMFiled July 27, 1935 4 Sheets-Sheet 1 INVENTOR. FRITZ APPELIUS HEINRICHLANGNER WM ATTORNEY.

Sept. 28, 1937. F. APPELIUS ET AL 2,093,988

MEASURED SERVICE TELEPHONE SYSTEM Filed July 27, 1935 4 Sheets-Sheet 2DAY FEE NIGHT FEE FREE FREE 00 0 a oozo o 2TU Ztr Zuur

INVENTOR. FRITZ APPELIUS HEINRICH LANGNER ATTORNEY.

Sept. 28, 1937. F. APPELIUS ET AL MEASURED SERVICE TELEPHONE SYSTEMFiled July 27, 1935 4 Sheets-Sheet 3 R SE RMN OLG Em TPL A m, H Zn WR RmF H W ATTORNEY? Sept. 28, 1937. F. APPELIUS ET AL I 2,093,938

MEASURED SERVICE TELEPHONE SYSTEM Filed July 2'7, 1935 4 Sheets-Sheet 4{0 00 0 Io Y if 15,20,

INVENTOR. FRITZ APPELIUS HEINRICH LANGNER ATTORNEY.

UNETED STA'iEfi PATENT GFFICE The subject matter of the presentinvention is a pay station with automatic payment control for local andshort distance calls, the payment of the fee being controlled by anoperator in the case of long distance calls. .In order to accomplishcontrol in short distance transmit impulses to the e to. the fee paidin, before commencing to dial, whereby .a switch is set corresponding tothe fee paid. A second switch is dialling the characterizing digitdefining the call zone, and the setting of this switch must correspondto the setting of th impulses.

If it is desired to use a p short distance calls also for long distancecalls,

difficulties arise since for fee payment by an operator audible signalsare used as beingmost suitable, these being produced by the insertion ofcoils at the pay station. The long distance call is effected in theknown way in that after applying forthe call the pay station is calledby the distant exchange and only then is the calling party asked totrolling impulses evoked by the insertion of coins for short distancecalls can only be utilized for fee control in long distance calls byconsiderable switching complication, since the settting up of longdistance calls is diiferent from the setting up of short distance calls.

It has already been proposed to provide switching devices in theexchange repeater associated with the pay station, by which thenecessary au- F dible signals are produced with the help of relaybuzzers controlled by the fee impulses.

Such additional device present invention.

station and the exchang ends, in switch over contacts which becomeoperative on the commencement of dialling, and in the pay station,switch over the line from the impulse transmitting device for paymentsignalling, to the dialling device and hand set; and in the exchangeswitch over impulse receiving devices switching process has a number offurther ad- By the switching over, all the numerous switching devicesnecessary for supervising the fee control and operating condition of thesystem are disconnected from the line during the conversation and thusthe connection between pay station and exchange is made as free asvantages.

possible from attenuation.

This is achieved according to the invention in that the line between thepay MEASURED SERVKCE TELEPHONE SYSTEM Fritz Appelius, Berlln-Spandau,and Heinrich Langner, Berlin-Steglitz, Germany, assignors toTelephon-Apparat Fabrik E. Zwietusch and Company, Berlin, GermanyApplication July 27, 1935, Serial No. 33,476 lln Germany July 31, 193419 Claims. (Cl. 179-63) In order to simplify the service in pay stationsthe switching over device in the pay station is made dependent upon anauxiliary magnet whose operation is in turn dependent upon switchingconditions in the exchange. By these means the moment for inserting thefee for a local short distance call can be left to the calling party. Itis merely necessary to insert the fee before commencing to dial, itbeing immaterial whether the receiver has already been removed or not.Since it is necessary to be able to pay the fee in different kinds ofcoins switches are provided in the exchange for each kind of coin. Itwould be desirable to use a single switching device which, on theinsertion of a coin of higher value, would be displaced by a number ofswitching steps corresponding to the number of coin units to which themore valuable coin is equivalent. The solution of this problem, however,involves difiiculties. Special coin storing devices must be provided inthe pay station from which the coins are released after a sufiicientinterval of time whereby in the case of a more valuable coin, a largernumber of controlling impulses, corresponding to the number of units towhich the coin is equivalent, can be transmitted for setting theswitching device in the exchange. From practical considerations,however, the devices in the pay station must be kept as simple aspossible. A simplification of the devices in the pay station quitejustifies an increased expenditure of switching devices in the exchangesince the supervision and attendance then-takes place at a centralposition. The use of several switching devices in the exchange forcharacterizing the number of inserted coins of each kind necessitates atranslating device in which the total value of the fee inserted in termsof the unit fee is characterized. According to theinvention an auxiliaryselector is used for the addition and translation of the fee which ischaracterized in various coins, this selector taking up successively thesettings of the individual payment selectors while at the same timetranslating the setting of the payment selector indicating high valuecoins, by being set according to the number of complementary steps ofthese selectors. The auxiliary selector eiTecting the totalling andtranslation is combined according to the invention with thediscriminating selector characterizing the zone to form an assemblywhich is only necessary during the setting up of the call and thus, inorder to decrease the number of devices in use in the exchange, is onlytemporarily brought into connection with theswitching devices of thecalling station.

an automatic payment calls it is known to xchange corresponding set inthe exchange by e switch set by the fee ay station equipped for thesupervision of the pay the fee. The cons are avoided by the eterminates, at both the line from the fee to the selectors. This For thepurpose of control it is necessary to provide separate call meters forlocal and short distance calls. The control of long distance calls isinsured by the preparation of call tickets. The control of the localpayment meter can take place in the usual way. On the other hand thesetting of the meter for short distance calls must take place independence upon the value of the call set up. The value of such a callis given by the setting of the fee selector which is set in the exchangeby the insertion of the coins. The setting of the short distance metermust, however, take place in units. The auxiliary selector effecting thetranslation and totalling characterize the value of the call onlythrough the number of the fee selectors which is complementary to theirsetting. Moreover, it should be noted that the auxiliary selector isonly switched on to the connection for a short time and only serves toascertain whether the fee corresponding to the zone dialled has beeninserted. After establishing this the selector has fulfilled its purposeand can be released for other calls. The displacement of the shortdistance meter should not take place, however, until the calledsubscriber replies. It is thus necessary that the criterion 01' thevalue of the call set up recorded in the totalling and translatingselector should be recorded in a switching device which is associatedwith the calling station during the whole duration of the call.

According to the invention a fee selector corresponding to one kind ofcoin is provided for this purpose, after which giving up its settingcorresponding to the value of the inserted coins steps to the normalposition and is set afresh corresponding to the total Value of theinserted fee in coin units. In order to make the controlling operationsas simple as possible this selector is not set on the step correspondingto the total fee, but on the corresponding complementary step whichcorresponds to the complementary step number of the inserted fee. Thus,when on the reply of the called subscriber this previously set selectoris brought to the normal position, the short distance meter is alsodisplaced by the number of steps corresponding to the number ofcomplementary steps. In order to achieve this result the complementaryvalue of the inserted coins, which is contained in the adding and.translating selector, is first transmitted to a further auxiliaryselector whose setting then corresponds to the total fee actuallyinserted. From this second auxiliary selector is effected thetransference of the complementary steps to the selector permanentlyassociated with the calling station, which thereby contains thenecessary complementary step number.

An embodiment of the invention will now be described with reference tothe drawings.

Figs. 1 and 2 represent a diagrammatic perspective view of themechanical construction of the pay station.

Fig. 3 shows the circuit arrangement of the pay station.

Figs. 4, 5, and 6 show the equipment located at the exchange.

The devices of Fig. 1 will be considered before those of Fig. 2. For thesake of clearness these parts are illustrated separately.

In Fig. l, I represents the receiver switch hook, which can rotate aboutthe axle 2 in the direction of the arrow. The position illustrated isthat obtaining when the receiver is in place. By means of its projectingportion the switch hook I engages under a pin 3 which is fastened to alever 4. The lever 4 is represented as being broken off, the lower endof it being seen again in Fig. 2.

On releasing the switch hook the lever I rotates and causes the lever 4to move in the direction of the arrow. Through the lowering of lever 4,lever B is rotated in the direction of the arrow about axle I which isfixed in the fixed member 9, the rotation being carried out against thepull of spring 8. Lever 6 engages by means of the pin 5 in a slit 25 oflever 4. Also lever II rotates about the axle III. A pin I2 is attachedto lever II to which is connected a spring I4 which is attached to lever6 by means of the pin I5. Spring I4 has the effect of rotating lever IIin the opposite direction to the motion of lever 6 when the latter iscaused to rotate by the removal of the receiver. Lever I I switches overthe contact set via whose individual contact springs are indicated inFigure 3, by Ivlc and 20k. This contact set represents the switchingover position in the pay station which was mentioned in the introductionto the description. The mo-- tion of lever II under the influence oflever 6 is restricted by a nose 2'! on lever II which bears against theright angle projection 26 of lever II. Lever II rotates about axle 28,and is pressed against the armature 23 of a magnet PM. The armaturespring 24 of magnet PM is adjusted so that when the armature 23releases, the lever II rotates in the direction of the arrow inopposition to the pull of spring 2I, and thus the nose 21 is lifted awayfrom the projection 26. Rotation of this lever I! in the same directioncan also take place by the operation of the dial 29.

On the shaft I8 of the dial 29 a cam I9 is fixed which engages with pin20 on lever I1, and on ope-rating the dial 29 moves the pin 20 in thedirection of the arrow, thus releasing lever II. Thus when the magnet PMis deenergized the contact set is immediately switched over on removingthe receiver. If, however, magnet PM is energized the contact set ckremains in its initial condition on removing the receiver until, onoperating the dial, the locking of lever II is removed by lever II.

In order to make Fig. 1 as clear as possible the further contact sets,which are operated by the switch hook I, are omitted. The same appliesto the contacts operated by magnet PM.

Fig. 2 shows the channel and collecting system. The coin channels areindicated by 33, 4| and 42. The apparatus is designed for use with theGerman coins. such as pig, 50 pig, and 1 mark. It should be understood,however, that it may also be operated by any of three different coinunits if desired without changing the principle of operation. Channel 33is provided for the 10 pfg. pieces. By means of the diverting strips 34and 35 the coin proceeding through channel 33 is thrust against the gong32. In its further passage it comes into contact with the projection oflever 36, which projects through into the channel 33. Under theinfluence of the weight of the coin the lever 36 is rotated about itsaxle 31. Lever 36 is counterbalanced by the weight 38. To lever 36 isalso attached a cam-like projection 39 which bears on the roller 40 ofthe coin contact for 10 pfg. pieces,-gklll. A slot is made in channel 33so that the lever 36, on being depressed by the coin can swing aroundout of the channel. The rotary motion of the lever 36 is so adjustedthat contact gkIO is opened once by cam 39. The coin proceeding throughthe channel 33 passes through the collecting funnel 53 to a receptacle54 from which, depending upon whether the call is set up or not, itpasses either to the receiving box H or the returned coin receptacle l2.Channel ll is provided for 1 mark pieces, which are thrust twice againstthe gong by means of the strips 48 and 49 and the terminal guide 5|. Theprojection 43 of lever ll projects into the coin channel ill, and pin 6attached to the same lever projects into channel 42. The contact setgk5ll is operated by lever 4'! by means of cam 52 associated with thelever. By loading the lever ll with a one mark piece the rotation of thelever which is thereby caused is sufiiciently large for the roller 13 ofthe contact set gk5fl to pass over the apex T5 of cam 52 so that whenthe lever 31 swings back under the influence of its counterweight 75 thecontact set glcfiil is operated a second time by the apex M of cam 52.Thus on inserting a one mark piece the contact set c7058 is openedtwice, and the gong is struck twice, with a suflicient time interval inbetween.

On the insertion of a 50 pfg. piece, which passes through channel 42,the lever ll is only rotated to such an extent that the roller l3 doesnot pass over the apex i l of cam 52. Thus only one operation of thecontact set Q7655 takes place.

The gong 3| also is struck only once by the 50 pfg. piece for the coinis thrust only once against the gong 3| by the terminal guide it. Theinserted' coins are then collected in the receptacle 54, the bottom ofwhich is formed by a slide-like structure. The slide consists of a stripforming an endless band which passes over rollers 56 and 57. The rollers55 and 51 are carried on bent levers ll and 78 which are fixed to thefixed member 19. The levers ll and lil carry rods 58 and 59 whichproject through a slit 6! in a lever 60. The rods 58 and 59 also passthrough the slot 63 in a fixed plate t l. The rods 58 and 59 are held inthe position shown by springs 8i and 82 attached to the fixed plate G l.Lever 56 engages with the collecting magnet KM. The magnet has a pin asfixed to its armature 83, and this engages with the lever 5G. Thus whenthe magnet KM energizes lever fill is moved in the direction of thearrow at. The result of this is that, by means of lever 6E1, pin 59 ismoved against the action of spring 82. Lever l8 is thereby rotated inthe direction of the arrow. Lever ll does not change its position by themotion of lever Ell in direction a. The effect of the rotation of leveri8 is that the slide 55 is given an inclined position so that the coinpresent in the receptacle 55 moves via the slide 55 and the chute 85into the coin box ll. On replacing the receiver the bar 4 is moved inthe direction of the arrow. At the same time, as will be described laterin the switching operations with reference to Fig. 3, the locking magnetSM is energized, and remains energized until the connection is releasedin the exchange. During this releasing period the collecting magnet KMcan energize, provided that the call has been set up, and the coins canbe collected in the receptacle 5%.

If the call is not set up the coins present in the receptacle 54 arereturned to the calling party on replacing the receiverj Lever G isconnected by a spring 86 to a lever Bl. The spring 86 is attached tolever 4 by means of a pin 88 and to lever 8'! by means of a pin 89. Atongue 90 is bent out from lever 81 and can engage with a locking leverThis lever 9i is rotatable about an axle 92 and is rotated by spring 93in the direction of the arrow, so that lever 9! tends to bearagainst theprojection fill of lever 81. The other end of lever 9| rests on thearmature 94 of magnet SM which has associated with it a strong armaturerelease spring. When the magnet is not energized the armature 94 causeslever B! to take up the position shown. When the armature is pulled up,however, lever 9| is pulled round by spring 93 and bears against thetongue 96 of lever 81, so that the latter cannot follow the motion oflever l when this lever moves in the direction of the arrow. As soon asmagnet SM deenergizes, however, the lever Bl follows the motion of lever4 in the direction of the arrow, being actuated by the spring 85. On theupward motion of lever 81 the pin 95 carried by the lever comes intocontact with lever 96, which can rotate about the axle 91, and is keptin the position shown by a spring 98. When the pin 85 presses againstlever 96 the latter is rotated, and its other end engages with a pin 99on lever (ill and consequently moves lever 60 in the direction of arrowb. The motion of lever 60 in the b direction causes lever ll to rotateand thus swings round the slide 55 about the roller 51, so that thecoins present in the receptacle 54 move via the chute it!!! into thereturned coin receptacle 12.

Since in the case of long distance calls the control of the collectingmagnet KM involves difiiculties, as was described in the introduction,the collecting is effected by the calling party by pressing a button 32.The button W2 is inserted in a fixed member EM and bears against a leverI63 which can rotate about an axle I04. The end of lever I03 is incontact with lever Gil, so that on pressing button 502, against theaction of spring 35, lever H13 pushes lever (ill in the a -direction.The movement of lever fill in the ti -direction results, as alreadydescribed, in the collection of the coins present in the receptacle 54.Through the rotation of lever I03 a gong is struck at the same timewhich indicates to the operator that the coins have been collected. Themicrophone Mg serves for transmitting the sound produced by the gongsSI, 32 and N16 for the purpose of payment supervision.

The circuits involved are divided into three parts.

Fig. 3 represents the switching devices in the pay station,

Fig. 4 represents the switching devices in the exchange which arepermanently associated with the pay station, and

Figs. 5 and 6 represent the zone determining device for payment controlwhich is only connected up during the establishment of the con-'nection.

The windings of the individual relays are differentiated from oneanother by roman figures. The wipers of individual selectors aresimilarly differentiated by prefixed roman figures. rotary magnets ofthe selectors are characterized by prefixing the letter M. .The contactsof the relays and magnets are characterized by small letters and aredifferentiated by ordinary numerals. The contacts of the selectors arealso char- The normal contact, F is the receiver, M8 is the speech -T 5microphone, Mg is the gong microphone for payment supervision. HUrepresents the switchhook contacts. SZ is the visual signal by which thetariff available is indicated in the pay station. When energized thevisual signal SZ indicates that the night tariff is available and thusthat the corresponding fee reduction for short distance calls has setin.

The normal condition of the system will first be considered. A currentflows over lines a and b to earth. Magnet PM is energized in the paystation, and in the exchange relays GIB and G5!) are energized.

Short distance call On setting up a short distance call the callingparty must insert the fee corresponding to the zone to be dialled beforedialling.

The case will be considered in which this fee amounts to RM 1.20. Thecalling party is at liberty to pay in the fee either in seven pfennigpieces and one fifty pfennig piece, or two ten pfennig pieces and onemark piece, or two ten pfennig pieces and two fifty pfennig pieces. The:insertion of the money may occur either before or after the removal ofthe receiver.

As was described with reference to Fig. 2, contact chili is openedtransitorily on each insertion of a 10 pig. piece, while when a 56 pig.piece is used contact c7050 is opened. The insertion of a one mark piececauses contact gk5il to be opened twice.

When a 10 pfg. piece is inserted the circuit over: earth, gkIiJ, PM,line 00, Ink, Ism, Ir, 3.2T, Id, 9H and H is broken, so that relay GIIJreleases. Relay H could not energize on account of the high resistanceof winding PMI, although Git was energized. Through the release of relayGlii the rotary magnet MID of the payment selector WIE! is energizedover contact Sold for the purpose of registering the inserted l pig.piece.

The counting of the 50 pig. pieces is effected by payment selector W553,which possesses three wipers IWEQ, IIWBIJ, and IIIWEB. The selectorsWlIl and W553 have 34 contacts and one dummy contact. The contacts ofselector WIB are wired so as to produce a rest position on contacts 24and 35. Selector W50 has rest positions on contacts 29 and 35. Thewiring of the selectors WID and W50 defines the highest number of coinsof one sort which can be inserted for setting up a call.

Thus in the embodiment, at the most nine 10 pfg. pieces and four 50 pig.pieces can be inserted, which corresponds to a total fee of RM 2.90. Therotary magnet M55 for the payment selector WII] energizes in thefollowing circuit: earth, 3r, to), Sc, MIG, battery.

The rotary magnet M58 of payment selector W50 energizes one theinsertion of a 50 pig. piece or a one mark piece, through thedeenergization of relay G56, over r, lgSD, 4e, M58, battery.

On inserting two pig. ieces and a one mark piece as in the example to beconsidered, selector Will is advanced from contact 24 to contact 26, andselector W58 from contact 29 to contact 3|. By removing the receiver thehigh resistance winding PMI in the pay station is short circuited by theclosing of switch hook contact II-IU, so that under the increasedcurrent thus produced relay H draws up. The energizing of relay H has toeffect the seizure of a selector for setting up the connection, and theconnection of the zone determining device. Relay H causes relay B toenergize over contact 271. and the contacts 4g),

3g5Il and Ir. Relay B locks up over its contact 51), and the contacts2a, 2p and flab. The preselector VW is set in operation over contact 6bin that its rotary magnet MVW is connected to the relay interrupter RUover wiper EVW, 6b, 415,

On testing on a free first group selector GH relay T energizes in thepre-selector over wiper IV vw. MVW is disconnected by contact 4t. A lineloop is set to the first group selector GW over Ib, so that relays AGand BG energize in this selector. Independently of the seizing operationfor connecting up a free group selector, a zone determining device isconnected up over contact 2b. Relay An energizes over 21) and 4p. Therotary magnet MAS of the call finder AS of a free zone determiningdevice is set in operation over contact an: earth, relay interrupter RU,an, 32, 5m, MAS, battery.

A testing circuit is set up over wiper VI of the call finder AS andcontact 21). In the calling equipment relay P energizes, and relay PRenergizes in the zone determining equipment. Through contact 510T therotary magnet MAS is disconnected and the call finder AS brought torest. Relay An is disconnected by contact 4p. Relays P and PR hold upover contacts 3p and 5t independently of relay T in the preselector. Theindependent seizure of the group selector GW and the zone determiningdevice enables the time taken up by the seizing to be as small aspossible. After the group selector and the zone determining device havebeen connected up, dialling can commence.

As has already been described with reference to Figs. 1 and 2, contactsInk and Zok are switched over on operating the dial, since on removingthe receiver the magnet PM was energized and remains energized till thecommencement of dialling. By the switching over of contacts Ink and21:70 relays Glil and G55 and also relay H are deenergized, since theearth is disconnected in the pay station and a loop is set up throughcontacts ink and 2227c over the speaking set of the pay station. By therelease of relays GIEJ and G551, relay D is energized in the followingcircuit: earth, 31', 3glll, 2g5il, lab, DI, battery. The line from thepayment control devices is switched over at contacts Id and M on to theline passing over the selector to the first group selector. Relay A inthe calling equipment energizes: earth, AI, Id, 321", IT, Ism, Ivic,speaking set, nsi, k, 23m, 21, 211, A11, battery. Over contact 3a relayA closes the loop for group selector GW, whose control relays AG and BGlock up independently of contact 3a. As the dial is operated relay A isenergized intermittently in synchronism with the dial impulses. Thefirst group selector and the subsequent selectors are controlled overcontact 3a. The locking circuit for relay B is opened at contact 2asince contact 279 has already been opened on connecting up the zonedetermining device. Over contact 3d relay D causes the slow energizingrelay E to energize. The slow to energize feature of relay E isnecessary so that the controlling impulse for relays GIO and G53produced by the switching over of contacts Ink and 212k in the paystation on account'of the disconnection of the earth in the pay stationcan become operative for advancing the rotary magnets MII! and M59without being shortened. The controlling impulse produced by theswitching over is of no consequence by itself. It cannot, however, bedispensed with and its operation must therefore be fully insured. Thisgizes.

additional displacement of the payment'selectors Will and W5!) which isnot produced by the in sertion-of a coin is provided for by theprovision of .the rest position in these selectors. On the re- 162158201.relays GIG and G56 magnet MID energizes over 31', 3g! ii, 3e, M10 andbattery, and magnet M50 over 5r, 4950, ie, M55 and. battery. The magnetsMia and M50 are deenergizeol by the opening of contacts of relay E.

When the dial is operated relay A energized intermittently insynchronism with the dial im" pulses. On the first release of relay Arelays V and VR energize over contact la in the following circuit:earth, 317, 412, la, V winding I, wiper IAS, 21', 527')", 301',- VR,battery.

Over contact lathe rotary magnet MWi of the discriminator WI isenergized in synchronism with the impulses corresponding to the diallednumber.

. It will be assumed that the digits 2 to Q in the first digit of anumber characterize local calls, 0 characterizes short distance calls,and 1 calls without charge. distance'calls is determined in theembodiment by the second digit. In the example assumed thecharacterizing number may be 08. After dialling the characterizingnumber 08 the wiper IWI' stands therefore on contact i8. Through thestepping of the discriminating selector W! at the commencement ofdialling the auxiliary selector S is set in operation in order to takeup the criterion for the inserted coins given by the position of thepayment selectors Wit and W553. The selector S is first setcorresponding to the rest contact of selector W50. At the beginning ofthis switching operation selector W55 stands on contact 32 so that thisselector has three steps remaining before reaching its normal positioncontact 35. Each step of selector W50 represents five payment units. Sothat the selector S shall execute a number of steps corresponding to thenumber of the rest contact of selector W5 in actual'monetary units, thecontacts of wiper IIIS of selector S are connected together at everyfifth step. When taking over the complementary steps of selector W50with simultaneous translation into payment units the following switchingoperations take place.

Relay X energizes over earth IIIWi, resistance Wz'3, relay X, 3m, 5U,IIIAS, IW5B, M59, and battery. Rotary magnet M59, however, remainsdeenergized. The slow release relay WR energizes over contact Id). Therotary magnet MS for auxiliary selector S energizes over contacts la:andwr. Contact ims of magnet MS short circuits relay X. Magnet M5dcannot energize, however, since the circuit contacts resistance WiB.Relay X releases, the magnet MS is deenergized, and the auxiliaryselector is advanced one step. This interaction is repeated until wiperHIS has reached contact 5. Magnet M50 can now energize over: earth,IIIS, contacts 5, 5a, ims, iu, IIIAS, |W50, M59 and battery. When wiperIIIS steps to the next contact magnet M58 deener- M50 again energizeswhen wiper IIIS reaches contact l0, and so on.

When wiper IW5 reaches contact 35 relay X remains deenergized. Afterrelay X has been deenergized for a short time the delayed release relayWR also deenergizes, so that relay U energizes over earth, Wiper V5,3101. Through contact Lu the payment selector W l B is now connected upfor homing in synchronism with. the auxiliary selector S. Contact 5arenders the resistance WIS inoperative, so that first relays X The scaleof charges for short and WR can energize and then rotary magnet Mill inthe following circuit: earth, 5a, im3, 3101', in, IIAS, Mill, battery.

Relay X and rotary magnet MS again operate as an automatic interrupter.Relay TR energizes over 311., iwr, VWl. Relay TR locks up over contact3h. As soon as Will has reached contact 35 the selector S has taken overthe number of complementary steps of the two payment selectors Wit andW50 and has simultaneously converted the steps of selector W5!) into thepayment units.

In the example considered the selector S is set on contact 23 (5 3-8).Contact 23 of wiper IS corresponds to a fee of RM 1.20, and is connectedwith contacts E8 of selector Wi. remained energized only during thetransmission of the dialled impulses. After the transmission of thesecond impulse train relays Y andC energize therefore over theirwindings I over contacts i221, wiper IWi, contact i8, IS contact 23, 2h,Zwv.

The energizing of relays Y and C forms the criterion for the payment ofthe fee for the selected short distance call. Relay F energizes throughwinding Fl over contact 5y and the high resistance W2'5 and wiper VAS,while on account of resistance Wi5 relay K receives sufiicient cur-'rent to energize. Relay F locks up over winding F11 and its contact 3fin dependence upon 2w. Relay C locks up over its winding CII and contactto in dependence upon the discriminating selector Wi over VwI.

Through contact 30 the rotary magnet MWI is connected to the relayinterrupter RU, so that the discriminating selector WI moves to the zeroposition. Through VWi the locking circuit for C on contact 0 is brokenand magnet MWI is brought to rest by the opening of contact 30. Relay Yis held up over its Winding YII and contact 2y in dependence upon wiperVS of auxiliary selector S. After the release of relay C, relay Xenergizes over contacts 550, Wi3, relay X, contacts 5y, 5c, 3q, wi l,battery. Relays: and magnet MS again operate as an automatic interrupterso that the auxiliary selector S steps to the zero position.

On the homing of selector S the discriminating selector W! is setafresh. It takes up the complementary steps of-selector S. The rotarymagnet MWi energizes over iy and Zms in synchronism with the rotarymagnet MS. During the homing of selector S relay TR is again energized,through the energizing of WR, over: earth, VWi, iwr, 3a, TR, battery.

When selector S is in the normal position relay KR is energized overcontact 0 of VS, contact Mr and winding II of relay KR. Relay KR locksup over its contact 4701 in dependence of VWI. Through contact 3701"relay C is operated over winding CII in dependence upon wiper VWI. Sincerelay Z is energized over winding Z! I, lpr, wiper VS, in the normalposition, relays PR and P are deenergized as soon as relays C and KR areenergized. Contact 52 is opened as are also the contacts 5kr and lo.

Through the homing of auxiliary selector S, the locking circuit forrelay Y, over its winding YII and wiper VS, was broken. The paymentselector W50 which is in the normal position, now takes up thecomplementary steps of selector WI in the following circuit: earth, VWI,4y, IVAS, 4 M56, battery. Relay N thereupon energizes in this circuit.Rotary magnet MWI is energized over contact 211; Contact Zmwl shortcircuits re- Relay VR two pig. pieces.

lay N so that M50 can energize. Both WI and W50 take one step. Throughthe release of relay N, MWI is deenergized. Relay N again energizes. Theswitching operations are repeated until WI reaches the zero position.All the relays in the zone determining equipment are deenergized whenselector WI reaches the zero position.

When the called subscriber replies the position of selector W50 can beused for controlling the short distance call meter, since number ofcomplementary steps exactly corresponds to the fee paid in monetaryunits.

The sum under consideration is 1.20 RM which was assumed to comprise two10 pfg. pieces and The payment selector WIO is therefore stepped from.contact 24 to contact 21 and the payment selector W50 from contact 29to contact 32. The remaining steps of the selector WI 0 thus amount to3527=8, and the remaining steps of selector W50 amount to 35-32:3. Theauxiliary selector is thus set on the contact corresponding to 3 5(15)+8=23. Selector W50 takes up the complementary steps of selector WI, i.e. it is set on contact 23:35-12. The number of remaining steps ofselector W50 is 12 which corresponds to the fee pair in of RM 1.20:12 ofthe monetary units.

When the called subscriber replies relay M energizes over 2], windingMI, and wiper IIIVW, since metering potential is connected in the knownway to the b-lead of the first group selector. Relay M locks up over 2m,and its winding MII, in dependence upon 26th. The locking winding MI isshort circuited by contact 4m so that relay F deenergizes. Relay KIpulls up over earth 515, If, IIW50, 3m, KI, DIII, battery. The rotarymagnet M50 is energized through contact sic. Relay K is again shortcircuited at contact 1115!], so that the selector W50 makes oneswitching step. This interaction is repeated until the selector W50 hasreached contact 34. (The starting position was contact 35.) Each timethat relay K energizes the short distance meter F2 is advanced by onestep over contacts lit and 2m. The release of the connection is broughtabout by the replacement of the receiver in the pay station. Theguarding magnet SM energizes over battery, AII, 2d, 2?", 28m, 2076,ZI-IU. The .high resistance Wi8, is connected up through contact 25m sothat relay A cannot hold up in the circuit mentioned. Relay A releasesand efiects the release of the connection. The metering impulse istransmitted to the preselector over the c-lead in the known way, so thatrelay ZR can energize over winding ZRI on account of the increasedcurrent produced. Relay ZR locks up over its contact 5257 in dependenceupon relay V which was energized over earth, 31), Ad I a, VI, Ip, VIIand battery, on the release of relay A. Contact 32? connects thecollecting potential to the a-lead so that the collecting magnet KM canenergize over earth, KM, Ism, Ir, 321, P and battery. In this circuitrelay P also energizes and causes relay V to deenergize by means ofcontact Ip. Relay V is slow to release so that relay ZR is onlydeenergized by the opening of contact In after a definite lapse of time,so that the collecting potential is connected to the line over contact3er for a suificiently long time. Through the disconnection of the groupselector, relay T releases and brings the pre-selector to the zeroposition by the energizing of rotary magnet MVW over contact 4t and therelay interrupter RU. Through the release of relay T relay AB energizesover earth,

3b, 4d, 315, AB and battery. Relay AB locks up over its contact lab independence upon relays GIO and G50. Contact 3ab connects an engagedbuzzer to the line to the pay station. Contact lab causes relay D todeenergize and contact 21112 disconnects the current from winding II ofrelay M.

So that the payment selectors WIO and W50 shall be set on the necessarycontacts 24 and 29 for setting up a new call relay K and winding III ofrelay D are energized over contact mo and Wiper IIIW50 and 3m, and relayHR and winding II of relay D over Wiper IIWIO. Relay K and rotary magnetM50 in the one case, and relay HR and rotary magnet MIO in the othercase operate as automatic interrupters until Wiper IIIW50 has reachedcontact 20 and wiper IIIwiil has reached contact 24. During the steppingof selectors W58 and WIO relay D still remains energized over itswindings D11 and DIII. As soon as the selectors WIO and W50 reachcontacts 2% and 29 relay D deenergizes, since the circuit for windingDlc over contact lab is already broken. As soon as earth is again connected to the ct and 17 leads after the switching over of contacts wkand 211k, relays GIO and G50 energize again. At contacts 2950 and 3g|0the locking circuit for relay AB is broken. The original condition isnow re-established. In the normal condition a current flows throughrelays Gill and G50.

Since the fees for short distance calls are variable according to thetime of day, a tariff switch TU is provided in the exchange. By means ofcontact ITU the high resistance winding G50II of relay G50 can be shortcircuited so that the visual signal SZ in the pay station receivessufficient currentQ Whether the visual signal is energized or notdetermines whether or not the day or night tariff is available. At thesame time a switching over on to wiper IIS of the auxiliary selector Stakes place by means of the tariff switch TU over contact 2m, thecontacts associated with wiper IIS'being connected, in correspondencewith the charge a1- teration, to the contacts of the discriminatingselector WI.

Disconnection of the zone determining device in the case on inadequatepayment As already described relay TR was energized on the setting ofthe auxiliary selector S on the complementary contact corresponding tothe fee paid, and locked up over contact Btr in dependence upon VWlAfter the second digit has been dialled in the case of a non-local callrelay Q energizes over earth, Wiper IIWi contacts II-"0, Itr, Zwr, 2m.Relays. Y and C only energize if the position of the discriminatingselector WI coincide with the position of the auxiliary selector S.Relay KR energizes through its winding KRII over contact Sq sincecontact 30 is in the normal position. Contact Ikr causes a strongcurrent impulse to pass over wiper VAS so that relays F and K in thecalling equipment draw up. Since the called subscriber has not yetreplied and relay M is thusdcenergized relay T is short circuitedcontact 370. The deenergizing of relay T eifects the release of theconnection. The homing of the preselector is controlled over contactRelays P and PR are caused to release by contact 575. Through thedeenergizing of PR the zone determining equipment is brought to thenormal position, as already described. Over contact Zab relays K and HRare energized over wipers IIIWSB and IIWl 23 which with the rotarymagnets M40 and Milli act as automatic interrupter and advance thepayment selectors Will and W513 to positions 2d and 29. The engagedbuzzer is connected to the line over contact 3111).

Local calls Before commencing to dial the local charge (10 pig.) must beinserted. The payment selector Wiil is taken to step 25 by the singleopening of contact gkit. On commencing to dial selector Will is movedfrom contact 25 to contact 2D as already described by the release ofGit, conditional on the switching over of contacts E2270 and 2117s.Selector W553 also moves from contact 29 to contact Eli. The zonedetermining devices (Fig. 5) have been connected up, as described,through contact 22). The totalling svritch S is set, by taking up thenumber of complementary steps of selectors Will and W58, on contact 33,by making 5 5=25 steps on taking up the complementary steps of Wtii and9 steps on taking up the complementary steps or" Wit.

Local connections are characterized by having digits 2-9 in the firstplace of their call numbers. As soon as one of these digits id dialledrelay J pulls up over its winding Ji since wiper 1W i is set on thecontact corresponding to the dialled digit. Relay C energizes overcontact if and the high resistance Wis in the following circuit: earth,ii, Wit, I5, contact t l, rTU, Etr, flwr, YI, CI, battery.

Relay Y does not energize. Through contact 37' the rotary magnet MWl orthe discriminator is protected against receiving further dialledimpulses. At contacts lo and ly the circuit for relays PR and P isopened as relay Z is already energized. Through contact 20 thediscriminating selector Wl is brought to the normal position by theenergizing of rotary magnet MWl over the relay interrupter RU. As soonas wiper VWi reaches the normal position relays J and C deenergize.Through the release of relay PR relay X is energized over battery, Wit,3y, ilpr, C, 35a, earth.

Relay WR is energized over contact ix and operates the rotary magnet MSover contact wrX and MS operate as an automatic interrupter so that theauxiliary selector S is brought to the normal position. When wiper VSreaches the zero position relay U is deenergized. Relay P in the callingequipment has deenergized. Relays F and K cannot draw up because relaysY and KR are deenergized. When the group selector is released onreplacing the receiver relay ZR energized. The local charge meter OZenergizes over earth, 5t, l l m, 222'. After the release of relay Trelay AB energizes as already described and over contact Zoo inconnection with relays K and HR advances the payment selectors W i iiand Wiiil into positions 24 and 29.

Free calls Connections which are made free of charge are characterizedby a call number having digit 1 as the first digit (for example 1 or01). The setting up of the connection is the same as for a local call.Since no money has to be inserted the payment selector W i ii isadvanced from contact 23 to 25 and selector Whii from contact 29 to 353on the switching over of contacts ink and 222k. Thus the auxiliaryselectors in taking up the complementary steps of selectors Wili andW550 has to make a total of 5 5+ 10:35 steps. Contact 35 of theauxiliary selector S is, however, not conearth. Relay D now deenergizes.

nected to a contact of the discriminating selector WI. Contact l of thediscriminating selector WI which characterizes the free zone isconnected to relay C so that this relay and relay J energize in thefollowing circuit: earth, lm', IWI, contact l or iii JIII, CI, battery.Relays C and J lock up over contact 2c in dependence upon wiper VWI. Thecircuit for relays P and PR is broken by contacts is and 57' as in thecase of a local connection.

The release operations and the homing of the selectors is effected bythe same way as has already been described in the case of a local call.As no charge is being made for the call, relay ZR does not energize onthe release of the connection so that the local call meter OZ isprevented from being advanced.

Incoming calls On the seizing of the calling equipment (Fig. 4) relays Rand T are energized. Contacts IT and Zr switch the line through on oneside of the calling equipment while disconnecting relays Git, and H, andcontacts it and 2t switch the line through on the other side of thecalling equipment.

The opening of contacts Sr and 57' prevents rotary magnets Mid and Mfrom energizing when relays Git and G58 deenergize. Relays HR and D areenergized over contact 61'. Relay E draws up over contact 3721". Relay Eis slow to operate so that the condenser C3 is shunted by contact toonly after a definite lapse of time.

Magnet PM was deenergized on the switching over of contacts 52" and 1?so that the bell in the pay station is connected to the line overcontact pm. As soon as the person in the paystation removes thereceiver, contacts ink and 21710 are immediately switched over,described already with reference to Fig. 1, since magnet PM is notenergized. Relay V energizes over contact id so that at contacts 312 andto relay A and condensers C! and C2 are out on" from the line. After theenergizing oi relays E and V the pay station is connected directly tothe final selector.

The control of the connection is from the final selector as for a normalstation. On the replacement of the receiver the final selector releases,the c-lead is disconnected and relays R and T deenergize. Through theopening of contact 61' relay HR deenergizes. Relay D continues enerizedover its winding DI, lab, 29', 5E), 3glfi, 3?. Relay E also remainsenergized since it looks up in the following circuit: battery, E, 3hr,26, 591%, 3r, earth. After relay T deenergizes, relay AB energizes overearth, 3b, id, 315, AB, battery. AB locks up over its contact tab independence upon the relays Git and G53, over 2g5ll, Sglll, 37* and Assoon as the normal circuit is set up, after replacement of the receiverand the return of contacts 5227c and 222k to the normal position, relaysGlfi and G50 draw up and breads the locking circuit for relay AB byopening contacts igiiil and Sglt.

Fee payment in the case of long distance calls The distant exchange iscalled by the calling party free from charge. The switching operationsinvolved have already been described. After stating the desiredconnection and the call number of the pay station the calling partyreplaces the receiver. The distant exchange then calls. The operationstaking place are those already explained for an incoming call. Theoperator asks the calling party to pay in the fee corresponding to theconnection. Since the contacts Ink and 2070 have been switched over ontaking up the receiver the gong microphone Mg is connected to the line.

The operator can tell the amount of money paid in by the tone producedas the coins strike the gongs. When the correct sum has been paid thecalling party is asked to press the metering button I92, by means ofwhich the money is collected. The collecting is also made perceptible bya tone signal I06.

In the case of disagreement as to the amount of money paid in thecalling party can retrieve the sum already paid by replacing thereceiver.

What is claimed is:

1. In an automatic telephone system, a paystation telephone and anexchange, a line connecting said telephone with the exchange, aswitching device at the exchange for determining the fee to be paid fora call, a second switching device at the exchange for extendingconnections, means responsive to the insertion of coins at thepaystation for transmitting impulses over the line to operate said firstswitching device, means responsive to the operation of the paystationcalling device for transmitting impulses over the line to operate saidsecond switching device, and switchover contacts in both ends of saidline for connecting the line first between said coin impulsetransmitting means and associated switching device and then between saidcalling device and associated switching device.

2. In an automatic telephone system, a paystation telephone and anexchange, a line extending therebetween, a first and a second switchingdevice at said exchan e, means at said paystation responsive to theinsertion of coins therein for operating said first switching deviceover said line, switchover means in said line at the paystation and atthe exchange normally connecting said coin means and said firstswitching device together, means for operating said switchover means, acalling device at said paystation, said calling device and said secondswitching device connected together by the operation of said switchovermeans, and means responsive to the operation of said calling device foroperating said second switching device over said line.

3. In a system as claimed in claim 2 wherein the switchover means in theline are operated consequent to the operation of the calling device.

4. In a system as claimed in claim 2, a switchhook for the paystationoperated responsive to the removal of the telephone receiver, anauxiliary magnet at said paystation operated responsive to the operationof said switchhook, and means for operating the switchover means in saidtelephone dependent upon the condition of said switchhook, saidauxiliary magnet and the calling device of said telephone.

5. In an automatic telephone system, a paystation telephone and anexchange, a line connecting said telephone with said exchange, a pair ofswitching devices at said exchange, means at said paystation responsiveto the insertion of coins therein for operating one of said switchingdevices over said line, means responsive to the operation of thepaystation calling device for operating the other of said switchingdevices over said line, switchover means located at both ends of saidline normally connecting said coin means and said first switching deviceto the line and in its alternate position connecting the calling deviceand the second switching device to the line, said switchover meansoperated in the case of outgoing calls from the paystation by theoperation of the calling device and in the case of incoming calls by theremoval of the receiver of the telephone.

6. In a paystation telephone set, switchover contacts for controllingthe circuit of said telephone, an operating lever for said switchovercontacts, a locking lever for holding said operating lever in its normalposition, a locking magnet which in its energized condition permits saidlocking lever to hold said operating lever in its normal position and inits deenergized condition moves the locking lever out of engagement withthe operating lever and permits the switchover contacts to operate, anda calling device coupled to said holding lever for operating the sameindependent of the condition of said locking magnet.

7. In a paystation telephone, a set of switch over contacts forcontrolling the establishment of a connection, an operating lever forcontrolling said switchover contacts, a switchhook operated by thetelephone receiver, means controlled by the movement of said switchhookfor operating said operating lever to operate said switchover contacts,a locking lever for preventing the operation of said operating lever bythe operation of said switchhook, a calling device and a magnet, boththe calling device and the magnet having means for moving said lockinglever to permit said operating lever to be operated by the switchhook tooperate said switchover contacts.

8. In a paystation telephone according to claim 7 wherein the magnetoperating the locking lever is provided with three different windings ofwhich one high resistance and one low resistance winding are connectedin series with one side of the telephone line while the third winding isconnected to the other side of the line, means responsive to theoperation of said switchhook on an outgoing call for short oircuitingsaid high resistance winding to operate the magnet and prevent theoperation of said locking lever until the calling device is operated,said magnet in its deenergized condition holding said locking lever outof engagement of said operating lever to permit operation of saidswitchover contacts by operation of said switchhook on an incoming call.

9. In a measured service telephone system, a paystation telephone and anexchange, a line connected therebetween, switchover contacts at saidtelephone for controlling the establishment of telephone connections,relays in said line at the exchange normally energized through saidswitchover contacts, means for opening said line circuit to deenergizesaid relays in the establishment of a connection, means for operatingsaid switchover contacts, the operation of said switchover contactsdisconnecting said line opening means and said relays from said line,and means for further extending the connections over the operatedswitchover contacts.

10. In a measured service telephone system, an automatic paystationtelephone and an exchange, a line connecting said telephone with theexchange, payment selectors at the exchange connected to said line,means responsive to the insertion of coins at said paystation inaccordance with a. certain zone called for operating said paymentselectors in accordance with the coins deposited, a totaling selectorfor totaling the sum of the coins deposited, said payment selectorstransferring their settings to said totaling selector, a discriminatingselector, said discriminating selector operated responsive to theoperation of the calling device at the telephone in accordance with thezone called, and means for testing the conformity of the setting of saidtotaling selector and said discriminating selector.

11. In a measured service telephone system, an automatic paystationtelephone, a totaling selector, means responsive to the insertion ofcoins in said paystation in accordance with a particular zone called foroperating said totaling selector correspondingly, a discriminatingselector, means responsive to the operation of the calling device insaid paystation in accordance with the particular zone called foroperating said discriminating selector correspondingly, means fortesting the conformity of the setting of both of said selectors, andmeans in case the settings coincide for permitting the extension of theconnection.

12. In a measured service telephone system, an automatic paystationtelephone and an exchange, a line extending therebetween, a pair ofpayment registering selectors at the exchange, means responsive to theinsertion of certain coins in said paystation for operating one of saidpayment selectors in accordance therewith over one side of the line andresponsive to the insertion of different coins for operating the otherof said payment selectors correspondingly over the other side of saidline, a totalizing selector automatically operated in accordance withthe settings of both of said payment selectors to register the sum oftheir settings, a discriminating selector operated responsive to thecalling device at the paystation to register the zone in which theconnection is to be extended and corresponding to the coins inserted,said discriminating selector and said totalizing selector coincidingwhen the amount of coins inserted agrees with the zone dialled, andmeans for preventing the extension of the connection in case the feedeposited and the zone dialled do not agree.

13. In a measured service telephone system as claimed in claim 12wherein the amount of the coins deposited may be varied according to thetime of day by changing the connections from said totalizing selectorwith said discriminating selector.

14. In a measured service telephone system according to claim 12 whereina meter is provided at the exchange which is operated by the paymentselectors in accordance with their complementary steps corresponding tothe coins inserted at the time the payment selectors are restoring tonormal.

15. In a measured service telephone system according to claim 14 whereinthe payment registering selectors are arranged individual to thepaystation line While the discriminating selector and the totalingselector are common to a plurality of lines and revert to normal afterthe desired connection has been successively established.

16. In a measured service telephone system as claimed in claim 14wherein in addition to the collection of inserted coins as a fee for theestablishment of connections a pair of meters are provided at theexchange, one meter operated when local calls are made and the othermeter operated when zone calls are made and completed.

17. In a measured service telephone system, an automatic paystationtelephone and an exchange, a line connecting the same, a paymentselector at said exchange associated with said line, means responsive tothe insertion of coins at said paystation for operating said paymentselector over said line in accordance with the value of said coins, atotaling selector at said exchange common to a plurality of paystationlines, a finder switch automatically operated to search forthe callingpaystation line and associate said totaling selector therewith, meansresponsive to the operation of the calling device at said paystation inaccordance with a particular digit dialled and corresponding to thecoins inserted for operating said totaling selector in accordancetherewith,

and means for testing whether the settings of said totaling selector andsaid payment selector coincide to enable the connection to be completed.

18. In an automatic telephone system, a paystation telephone and anexchange, a line connecting said paystation with the exchange, a callingdevice at said telephone having means for transmitting impulses oversaid line, a switching device operated by said impulses to extend aconnection in the exchange, means at said paystation for transmittingimpulses over said line responsive to the insertion of coins therein, asecond switching device at the exchange operated by the impulses sent bythe insertion of coins to register the fee for a call, together withmeans for switching the line from the switching device controlled bycoin impulses to the switching device controlled by the calling deviceimpulses.

19. In an automatic telephone system, a paystation telephone and anexchange, a line connecting the telephone with the exchange, a callingdevice in said paystation for transmitting impulses to said exchange toextend a connection to a desired subscriber, a discriminating switch atthe exchange also operated by said impulses, a plurality of coincontacts at said paystation each operated momentarily by the passage ofcorresponding coins, coin relays at said exchange each responsive to theoperation of an associated coin contact, a coin switch operated by saidcoin relays, and means for preventing the extension of the call in casethe positions to which said discriminating switch and said coin switchare operated do not coincide.

FRITZ APPELIUS. HEINRICH LANGNER.

